DE102019120209A1 - METHOD FOR MAKING A TOOL AND TOOLS MADE THEREFOR - Google Patents

Abstract

A method (2) of manufacturing a tool comprising the steps of preparing a cylindrical blank (5), the blank (5) being divided into sections (51, 52); changing an outer diameter (d1) of one of the sections (51) and shaping the sections (51, 52) to complete a tool (4); during the shaping (c) the portion (51) whose outer diameter (d1) is changed is shaped into a symmetrical polygon (p1) to be used as a head portion (41) of the tool (4) and for shaping another Section (52) to obtain a polygon (p2) with alternating concavities and convexities thereon, which can be used as an engagement piece (43) of the tool (4). Accordingly, the progressive implementation of the method (2) prevents the blank (5), which consists of a hard steel material, from deteriorating, in order to maintain the good mechanical properties of the tool (4), to increase the efficiency in production and to increase the production costs reduce.

Description

Technical field

The present invention relates to a method for producing, in particular a method for producing a tool and tools produced therewith.

State of the art

In general, tools for self-drilling and self-cutting of the screws are used and are also high-torque instruments with which driving forces can exert for rotating the screws, even if they are held with a drive mechanism or in the hand. The tool mostly consists of alloys and steel materials with a high carbon content. A crack problem can easily occur due to the high carbon content when processing the material by pressing or by pressing during forging. This fact also leads to some defects such as deformations, breaks, displacements of the crystal grains and the creation of hollows. Even if a blank is formed in the tool, this tool is then treated with tempering, but the finished product is still a defect-prone product.

1. (A) Vorbereiten eines zylindrischen gewalzten Walzdrahts;
2. (B) Behandlung des Walzdrahts mit einem Dressierprozess, um einen sechskantigen Walzdrahts zu formen;
3. (C) Erhalten eines sechskantigen Rohlings durch Schneiden einer Länge des sechskantigen Walzdrahts;
4. (D) Behandlung beider Enden des sechskantigen Rohlings durch Drehen, ein Bearbeitungsverarbeiten und durch ein nachfolgendes Abfasen;
5. (E) Ändern eines Teils des sechskantigen Rohlings neben einem der anderen Enden, um eine ringförmige Rille zu bilden;
6. (F) Ändern des anderen Endes des sechskantigen Walzdrahts in einen Rohling; und
7. (G) Fräsen eines distalen Endes des Rohlings zum Formen eines Werkzeugkopfs, um auf diese Weise ein Werkzeug herzustellen.

To produce a tool, the materials are subjected to the necessary treatments using machine tools and tool milling machines. The 1 shows that a prior art method comprises the following steps:

1. (A) preparing a cylindrical rolled wire rod;
2. (B) treating the wire rod with a skin pass process to form a hexagonal wire rod;
3. (C) obtaining a hexagonal blank by cutting a length of the hexagonal wire rod;
4. (D) treating both ends of the hexagonal blank by turning, machining, and subsequent chamfering;
5. (E) changing a portion of the hexagonal blank adjacent one of the other ends to form an annular groove;
6. (F) changing the other end of the hexagonal wire rod into a blank; and
7. (G) milling a distal end of the blank to form a tool head to thereby produce a tool.

However, the method according to the prior art is uneconomical because of the longer processing time and many wastes, so that further improvements are required.

Object of the invention

An object of the present invention is to provide a method of machining the high carbon material by forging, thereby improving the efficiency of tool making and reducing the cost of tool making.

The method of the present invention is to manufacture a tool with a head portion that is formed into a symmetrical polygon while an engaging piece is formed opposite or attached to the head portion and has a polygonal contour with alternating concavities and convexities thereon. An outer diameter of the engagement piece is smaller than an outer diameter of the head section. The method includes the steps of preparing a cylindrical blank, machining the blank so that the blank can be divided into a first section and a second section, changing an outer diameter of the first section and forming the first section into a symmetrical polygon, to use this as the head portion of the tool, the second portion also being shaped to have a polygonal contour with alternating concavities and convexities thereon. The shaped second section is used as the engagement piece of the tool. Preferably, the method also forms an annular position groove in an annular manner on the first section. The steps for performing the method are accordingly carried out in order to prevent the deterioration of the properties of the blank made of the high carbon material, so that the good mechanical properties of the tool are maintained. With the progressive implementation, the efficiency of the production of the tools on the one hand and the manufacturing costs on the other hand are reduced.

The advantages of the present invention will become more apparent upon reading the following descriptions with reference to the accompanying drawings.

Figure list

• 1 shows a schematic view for illustrating a method for producing a tool according to the prior art;
• 2nd Fig. 3 is a block diagram illustrating the steps of performing a method of the present invention for manufacturing a tool in sequential order;
• 3rd and 4th show schematic views of the tools to be produced according to a first preferred embodiment of the present invention;
• 5-1 Fig. 3 is a schematic view showing the steps for carrying out the first preferred embodiment of the present invention;
• 5-2 Fig. 11 is a schematic view showing a variation of the first preferred embodiment of the present invention;
• 5-3 to 5-7 are schematic partial views showing the variations for the shape processing of the first preferred embodiment of the present invention;
• 6 Fig. 11 is a schematic view showing the molding dies for the molding of the present invention;
• 7 Fig. 1 is a schematic view showing the first rolling dies for the first preferred embodiment of the present invention;
• 8th shows a schematic view of a tool to be produced by means of the second preferred embodiment of the present invention;
• 9 Fig. 11 is a schematic view showing the steps for performing the second preferred embodiment of the present invention;
• 10th Fig. 2 is a schematic view showing the first rolling dies for the second preferred embodiment of the present invention;
• 11 Fig. 3 is a schematic view showing the steps for performing a third preferred embodiment of the present invention;
• 12th Fig. 11 is a schematic view showing a variation of the third preferred embodiment of the present invention;
• 13 Fig. 3 is a schematic view showing the steps for performing a fourth preferred embodiment of the present invention; and
• 14 Fig. 11 is a schematic view showing a variation of the fourth preferred embodiment of the present invention.

Ways of Carrying Out the Invention

The 2nd shows that a method 2nd a preparation step for manufacturing a tool of the present invention (a) , a section division (b) and a shape (c) includes. In a first preferred embodiment of the present invention, the method 2nd for making a tool 4th performed, which is mainly a first ending A1 , a second end A2 the first end A1 opposite, a head section 41 and an engagement piece 43 (please refer 3rd and 4th ) having. In particular, the head section extends 41 from the first end A1 and has the shape of a symmetrical polygon p1 on. The engagement piece 43 is between the head section 41 and the second end A2 educated. In this preferred embodiment, the engagement piece extends 43 from the head section 41 to the second end A2 and has the shape of a polygon p2 with several alternate concavities and convexities formed on it.

The 5-1 shows that in the preparatory step (a) a cylindrical blank 5 is being prepared. The cylindrical blank 5 is a part cut from a length of rolled wire rod. When dividing the sections (b) becomes the blank 5 edited to the blank 5 in a first section 51 and a second section 52 , which differs from the first section 51 extends to subdivide. An outer diameter d1 of the first section 51 corresponds to an outer diameter d2 of the second section 52 who is in the B type in the 5-1 shown or larger than the outer diameter d2 of the second section 52 who is in the A type in the 5-1 is shown. When accepting the A type, pressure can be put on the blank 5 by gradual pressing or by suitable means to reduce the outside diameter of the pressed part, as shown, for example, in the drawing, in which the outside diameter d2 of the second section 52 is reduced. The first paragraph 51 and the second section 52 can be easily distinguished from each other to facilitate the subsequent shaping operations.

The shape (c) includes preparatory shaping work (c1) and mold processing (c2) . With the preparatory shaping work (c1) becomes the first section 51 to the Editing of its size or contour machined, especially around its outer diameter d1 enlarge in suitable ways. For example, one end of the first section 51 with a punch 331 pressed to the length of the first section 51 shorten and thus its outer diameter d1 is enlarged, causing the outer diameter d1 of the first section 51 larger than the outside diameter d2 of the second section 52 becomes. This condition creates a sufficiently large circumference or area for the benefit of the next shaping work. The two-part arrangement due to the different outer diameters d1 , d2 also facilitates further gripping or feeding during molding.

The form processing (c2) will after processing (c1) carried out. In this processing (c2) becomes the first section 51 into a symmetrical polygon p1 shaped, this section being the head section 41 of the tool 4th after molding is used. The head section 41 is held in place by a drive mechanism, such as a pneumatic mechanism, to transmit the rotational forces. The second section 52 also becomes a polygon p2 with alternate concavities and convexities formed on this, this section being the engaging piece 43 of the tool 4th after molding is used. The engagement piece 43 is engaged with hexagon socket screws in order to exert further forces on the screw heads.

Regarding the processing of forming a symmetrical polygon p1 for the first section 51 in mold processing (c2) become pressing tools 3rd like in the 6 shown for molding the first section 51 used. Preferably with the press tools 3rd Compressive forces on the first section 51 exercised to the first section 51 to press and gradually in the form of a symmetrical polygon p1 to form, ie into a polygon with even sides. It is also possible that the first section 51 is grooved in a ring. For example, the first section 51 with the second rolling dies 7 pressed annularly around an annular position groove g1 ring-shaped on a peripheral surface of the first section 51 to form (see 5-1 and 5-2 ). The formation of the annular position groove g1 can cooperate with the drive mechanism for transmitting the forces, thereby also aiding gripping and feeding in order to form the second section 52 to facilitate.

Regarding the shaping of a polygon p2 with alternating concavities and convexities for the second section 52 in mold processing (c2) become the first rolling dies 6 we in the 7 shown for molding the second section 52 used. Preferably the second section 52 by rolling between the first rolling dies 6 pressed, gradually forming it around a polygon p2 to form, on which alternate concavities and convexities are formed, ie a polygon with concave recesses and convex ridges, which are each formed between two concave recesses formed next to one another. In addition, with these alternating concave and convex arrangements, an entire area of the second section 52 covered so the polygon p2 succeeds or with the head section 41 after molding is connected (see 3rd ). The polygon alternately covers p2 a partial area of the second section 52 so the polygon p2 after molding the head section 41 is formed opposite (see 4th ). Therefore, it will consist of two sections 51 , 52 existing tool 4th after the complete shaping of the two sections 51 , 52 made to act as the head section 41 or as the engagement piece 43 to be used.

The operations described above are progressively performed in order to avoid the problem that a hard steel material cannot be forged, to avoid the unnecessary consumption of the material which is wasted in the prior art with the calibration method according to the prior art, and in material costs to save. The form processing (c2) uses the pressing and rolling process, so that the properties of the blank made of hard steel material are not deteriorated during the process. Therefore, with the tool 4th good mechanical properties are maintained. The progressive implementation of the method 2nd accelerates the manufacture of the tool 4th , the manufacturing efficiency is improved and the cost is reduced.

As the 9 shows a second preferred embodiment of a method 2nd performed to one in the 8th shown tool 4th with opposite first and second ends A1 , A2 , at least one blank section 42 , one from the first end A1 to the blank section 42 extending head portion 41 to make the latter the shape of a symmetrical polygon p1 has, and an engagement piece 43 that between the head section 41 and the second end A2 is formed. In this preferred embodiment, the engagement piece extends 43 from the blank section 42 to the second end A2 and has the shape of a polygon p2 with alternating concavities and convexities. The sections 41 , 42 , 43 have different outside diameters. In this preferred embodiment, the method comprises 2nd further a preparatory step (a) , a Section subdivision (b) and a shape (c) . In the preparatory step (a) becomes a cylindrical blank 5 prepared, which is cut from a length of rolled wire rod. In the section subdivision (b) becomes the blank 5 edited to the blank 5 in a first section 51 , a second section 52 and at least in a third section 53 between the two sections 51 , 52 to divide. The processing for dividing the blank 5 in sections may correspond to that described in the first exemplary embodiment, this description being omitted here. As for example in the 9 shown, a single third section extends 53 from the first section 51 to the second section 52 . The three sections 51 , 52 , 53 have respective outer diameters d1 , d2 , d3 that differ from each other. The outside diameters are preferred d3 of the third section 52 larger than the outside diameter d2 of the second section 52 , but smaller than the outside diameter d1 of the first section 51 to form a three-part arrangement, which is advantageous for the subsequent shaping work. The blank 5 can also be divided into further sections if required.

The 9 shows that in a preparatory shaping work (c1) the shape (c) the dimension of the first section 51 is changed, ie the outer diameter d1 of the first section 51 is enlarged to facilitate the subsequent molding work as described above in the first embodiment. After that, the mold processing (c2) performed the enlarged first section 51 and the second section 52 to shape. The enlarged first section 51 is shaped to be a symmetrical polygon p1 to form and thus as the head section 41 of the tool 4th to use. The second section 52 is shaped to be a polygon p2 to form with alternating concavities and convexities and thus as the engagement piece 43 of the tool 4th to use. The third section 53 is called the blank section 42 of the tool 4th used. It should be noted that the mold processing (c2) using the pressing tools 3rd includes (see 6 ), the first section 51 compressed and then shaped. This step also includes the rolling of the second section 52 between the first rolling dies 6 (please refer 10th ), the second section 52 pressed and then molded. A tool 4th is accordingly made in this manner after performing the molding described above. The steps for performing are carried out progressively to achieve the same effects as described in the first embodiment as described above.

The 11 shows that a third embodiment of a method 2nd continue a preparatory step (a) , a section division (b) and a shape (c) includes. The concatenation of the related elements and goals of the steps (a) and (b) correspond to those of the second preferred exemplary embodiment, so that their description is to be omitted here. In the third preferred embodiment, the method 2nd for making a tool 4th including at least one blank section 42 , a head section 41 and an engagement piece 43 performed, which have already been described in the second preferred embodiment. In particular, the head section 41 and the blank section 42 be grooved in a ring. For example, the tool 4th an annular position groove g1 on that ring-shaped on the head section 41 is formed to engage a drive mechanism (see Type A in the 11 and 12th ). Alternatively, the tool points 4th at least one first annular auxiliary groove g2 and at least a second annular auxiliary groove g3 between the annular position groove g1 and the second end A2 on that as Type B in the 11 and 12th are shown. Regarding type B in this preferred embodiment, preparatory molding work (c1) the shape (c) the method 2nd performed the outer diameter of the first section 51 to enlarge by pressing. Mold processing also includes (c2) forming an annular position groove g1 by annularly pressing the first section 51 and also annularly forming at least one auxiliary annular groove between the annular position groove g1 and the polygon p2 of the second section 52 . For example, a peripheral surface of the first section 51 pressed around a first annular auxiliary groove g2 to form an annular shape on this, while a peripheral surface of the third section 53 is pressed in a ring shape around a second annular auxiliary groove g3 to form a ring on this.

The ring-shaped auxiliary grooves g2 , g3 can also be used for the two-part arrangement of the first preferred embodiment (see 5-3 to 5-7 ), the variations in shape processing (c2) are shown. Next are the ring-shaped auxiliary grooves g2 , g3 and the annular position groove g1 ring-shaped with at least one second roller die 7 formed, wherein this second rolling die for the annular pressing of the respective peripheral surfaces on the sections are used to accelerate the manufacturing process, improve the efficiency of manufacture and reduce costs. The term “at least” is used here to indicate that the configuration of the second roller dies can be adjusted depending on the formation of the grooves. For example, the annular auxiliary grooves g2 , g3 and the annular position groove g1 with the same set of the second roller dies 7 formed concurrently (see 5-3 and 5-4 and type B the 11 and 12th ). Alternatively, these are made using different sets of the second roller dies 7 , 7 ' formed at different times (see 5-5 to 5-7 , 13 and 14 ).

In the preferred embodiments of the present invention, the annular position groove can g1 annular before forming the first section 51 in the symmetrical polygon p1 formed (see for example the 5-2 , 5-4 to 5-6 , 11 and 13 ) or ring-shaped after the first section 51 in the symmetrical polygon p1 is shaped (see for example the 5-1 , 5-3 , 5-7 , 12th and 14 ) if the mold processing (c2) the formation of the sections 51 , 52 and the formation of the annular position groove g1 includes. Considering that the link arrangement or the recessed or grooved section may be advantageous for gripping or feeding during the shaping work, the shaping of the second section can be carried out 52 depending on either the formation of the first section 51 or the formation of the annular position groove g1 or both of these can be varied, as exemplified in Figs. is shown.

In summary, the method of the present invention includes the steps of preparing a cylindrical blank, dividing the blank into at least two sections, changing the outside diameter of one of the sections, and shaping the sections so that the sections have a polygonal shape to make a tool. Since the steps are carried out in a progressive order, the properties of the high-carbon steel material can be prevented from deteriorating when the blank is machined, so that the finished tool has good mechanical properties. The method also improves manufacturing efficiency and reduces manufacturing costs.

Despite the illustration and description of the exemplary embodiments, it goes without saying that further variations and modifications can be made without departing from the scope of the present invention.

Reference list

2nd

Method of making a tool

(a)

Preparatory step

(b)

Section subdivision

(c)

Shaping

(c1)

Preparatory shaping work

(c2)

Mold processing

4th

Tool

A1

First end of the tool

A2

Second end of the tool

331

Punching tool

41

Head section

42

Blank section

43

Engagement piece

g1

Annular position groove

g2

First ring-shaped auxiliary groove

g3

Second ring-shaped auxiliary groove

5

blank

51

first section

52

second part

53

Third section

3rd

Pressing tools

6

First rolling dies

7

Second roller dies

p1

Symmetrical polygon

p2

Polygon with alternating concavities and convexities

d 1

Outside diameter of the first section

d2

Outside diameter of the second section

d3

Outside diameter of the third section

Claims (9)

A method (2) for manufacturing a tool for manufacturing a tool (4), in which the opposite first and second ends (A1, A2), a head section (41) extending from the first end (A1) in the form of a symmetrical polygon (p1) and an engagement piece (43) formed between the head portion (41) and the second end (A2) and having a shape of a polygon (p2) with alternating concavities and convexities, comprising the steps of: a preparation step (a ) which comprises preparing a cylindrical blank (5); a section subdivision (b) comprising machining the blank (5) to thereby subdivide the blank (5) into a first section (51) and a second section (52); and a shaping (c) which involves performing preparatory shaping work (c1) and Molding processing (c2), wherein the preliminary shaping work (c1) comprises changing an outer diameter (d1) of the first section (51) by pressing to make the outer diameter (d1) of the first section (51) different from an outer diameter (d2) of the form second section (52); the mold processing (c2) is carried out after the preparatory shaping work (c1); the shape processing (c2) comprises shaping the first section (51) into the symmetrical polygon (p1) in order to use this as the head section (41) of the tool (4) and to shape the second section (52) in order to form the polygon ( p2) with alternating concavities and convexities on it, the second section (52) being used as an engagement piece (43) of the tool (4) after the molding. The method (2) according to Claim 1 for producing the tool (4), which further comprises at least one blank section (42) between the head section (41) and the engagement piece (43), the section subdivision (b) of the method (2) forming at least a third section (53) between the first section (51) and the second section (52); the second and third sections (51, 52, 53) have respective outer diameters (d1, d2, d3) which differ from one another; the third section (53) is used as the blank section (42) of the tool (4) after completing the molding (c). The method (2) according to Claim 1 or 2nd wherein the preliminary molding work (c1) comprises pressing an end of the first portion (51) with a punch (331) to enlarge the outer diameter (d1) of the first portion (51). The method (2) according to one of the Claims 1 to 3rd , wherein the molding processing (c2) comprises the steps of using the pressing tools (3) to exert the compressive forces on the first section (51) in order to form this first section (51) into the symmetrical polygon (p1) and also the pressing of the second section (52) by rolling between the first rolling dies (6) to form the second section (52) for forming the polygon (p2) with alternating concavities and convexities thereon. The method (2) according to one of the Claims 1 to 4th wherein the shape processing (c2) comprises the steps of annularly pressing the first portion (51) to form an annular position groove (g1) on a peripheral surface of the first portion (51). The method (2) according to Claim 5 wherein the shape processing (c2) comprises the steps of forming at least one auxiliary annular groove (g2, g3) in an annular manner between the annular position groove (g1) and the polygon (p2) of the second portion (52); the ring-shaped position groove (g1) and the at least one ring-shaped auxiliary groove (g2, g3) are ring-shaped with at least one second roller die (7, 7 '). The method (2) according to Claim 6 , wherein the annular position groove (g1) and the at least one annular auxiliary groove (g2, g3) are formed in the same direction. The method (2) according to Claim 6 , wherein the annular position groove (g1) and the at least one annular auxiliary groove (g2, g3) are not formed in the same direction. The method (2) according to Claim 2 , wherein the outer diameter (d3) of the third section (53) is larger than the outer diameter (d2) of the second section (52), but smaller than the outer diameter (d1) of the first section (51).

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